/*
 * 文 件    名:  NetWorkUtil.java
 * 创建日期:  2012-9-28下午2:06:00
 * 版          权:  Epro Technologies Co., Ltd. Copyright 2011-2012,  All rights reserved
 * 作          者:  hjd008
 */
package com.weipu.common.util;

import java.util.List;

import android.content.Context;
import android.location.LocationManager;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.telephony.TelephonyManager;

/** 
 * @Description 检测网络情况
 * @version [版本号, 2012-9-28]
 * @see [相关类/方法]
 * @since [产品/模块版本]
 * 
 * @author hjd008
 */
public class NetWorkUtil
{
    
    /**  
     * 网络是否打开  
     *   
     * @param activity  
     * @return  
     */
    public static boolean isNetworkAvailable(Context context)
    {
        ConnectivityManager connectivity = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
        if (connectivity == null)
        {
            return false;
        }
        else
        {
        	NetworkInfo[] info = null;
        	try{
        		info = connectivity.getAllNetworkInfo();
        	}catch(Exception e){
        		return true;
        	}
           
            if (info != null)
            {
                for (int i = 0; i < info.length; i++)
                {
                    if (info[i].getState() == NetworkInfo.State.CONNECTED)
                    {
                        return true;
                    }
                }
            }
        }
        return false;
    }
    
    /**  
     * Gps是否打开  
     *   
     * @param context  
     * @return  
     */
    public static boolean isGpsEnabled(Context context)
    {
        LocationManager locationManager = ((LocationManager)context.getSystemService(Context.LOCATION_SERVICE));
        List<String> accessibleProviders = locationManager.getProviders(true);
        return accessibleProviders != null && accessibleProviders.size() > 0;
    }
    
    /**  
     * wifi是否打开  
     */
    public static boolean isWifiEnabled(Context context)
    {
        ConnectivityManager mgrConn = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
        TelephonyManager mgrTel = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
        return ((mgrConn.getActiveNetworkInfo() != null && mgrConn.getActiveNetworkInfo().getState() == NetworkInfo.State.CONNECTED) || mgrTel.getNetworkType() == TelephonyManager.NETWORK_TYPE_UMTS);
    }
    
    /**  
     * 判断当前网络是否是wifi网络  
     * if(activeNetInfo.getType()==ConnectivityManager.TYPE_MOBILE) { //判断3G网  
     *   
     * @param context  
     * @return boolean  
     */
    public static boolean isWifi(Context context)
    {
        ConnectivityManager connectivityManager =
            (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();
        if (activeNetInfo != null && activeNetInfo.getType() == ConnectivityManager.TYPE_WIFI)
        {
            return true;
        }
        return false;
    }
    
    /**  
     * 判断当前网络是否是3G网络  
     *   
     * @param context  
     * @return boolean  
     */
    public static boolean is3G(Context context)
    {
        ConnectivityManager connectivityManager =
            (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();
        if (activeNetInfo != null && activeNetInfo.getType() == ConnectivityManager.TYPE_MOBILE)
        {
            return true;
        }
        return false;
    }
    
    //另外还有两个方法判断网络是否可用：
    
    public static boolean isNetworkAvailable_00(Context context)
    {
        ConnectivityManager cm = ((ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE));
        if (cm != null)
        {
            NetworkInfo info = cm.getActiveNetworkInfo();
            if (info != null && info.isConnectedOrConnecting())
            {
                return true;
            }
        }
        return false;
    }
    
    public static boolean isNetworkAvailable_01(Context context)
    {
        ConnectivityManager cm = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo network = cm.getActiveNetworkInfo();
        if (network != null)
        {
            return network.isAvailable();
        }
        return false;
    }
    
    //更加严谨的写法： 
    public static boolean checkNet(Context context)
    {
        
        try
        {
            ConnectivityManager connectivity =
                (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
            if (connectivity != null)
            {
                
                NetworkInfo info = connectivity.getActiveNetworkInfo();
                if (info != null && info.isConnected())
                {
                    
                    if (info.getState() == NetworkInfo.State.CONNECTED)
                    {
                        return true;
                    }
                }
            }
        }
        catch (Exception e)
        {
            return false;
        }
        return false;
    }
    
}
